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I observed a very strange car a few days ago when driving:
The rear wheels are mounted at an angle. Meaning, the plane of rotation is not vertical; rather, the distance between the wheels is wider at the bottom and narrower at the top. Here is an illustration of what I mean:
I was worried that the wheels might come off, but they did not. I also observed that the tire seems to be wider and larger in diameter than the standard tire. There is a chance that the larger wheel will not fit in the original space of the chassis but I am not sure.
The vehicle was a Lexus if that information is relevant. I was not able to drive close enough to note the model, but it appears otherwise to be an ordinary saloon.